Update CONTRIBUTING.md

Updated CONTRIBUTING.md to specify that the `this` keyword should be avoided.
Fixes #35: Solution file should be located in the root of the repository
Update README.md
Update README.md
Update README.md
Update README.md

Add links to Google Groups and JabbR
Update README.md

Add a link to the samples repository
Remove samples directory
Merge branch 'master' of github.com:scriptcs/scriptcs

* 'master' of github.com:scriptcs/scriptcs:
  Update README.md
Fixing logic to load script packs from the bin folder
fix
Cleaning up script packs, adding the script pack context namespace, and adding unit tests
Moving ScriptHost and ScriptHostFactory back to ScriptCs as there is nothing Roslyn specific. Adding ScriptCs.Core to default script references
adding moved and deleted files, and renaming Get to Require
Merge branch '147' of github.com:glennblock/scriptcs into 147
issue #169 - added Save command
added tests for #169
Merge branch 'dev' of https://github.com/scriptcs/scriptcs into dev-169

Conflicts:
	src/ScriptCs/Command/CommandFactory.cs
	src/ScriptCs/ScriptCsArgs.cs
Adding to filter out adding null contexts
added grouping to get latest versions only